package com.hmdp.service.impl;


import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.servlet.http.HttpSession;
import java.util.HashMap;
import java.util.Map;
import java.util.Random;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Autowired
    private StringRedisTemplate stringRedisTemplate;
    /**
     * 发送验证码
     */
    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1.校验手机号
        if (RegexUtils.isPhoneInvalid(phone)) {
            //2.如果不符合，返回错误信息
            return Result.fail("手机号格式错误！");
        }
        //3.符合，生成验证码
        String code = RandomUtil.randomNumbers(6);
        //4.保存验证码到session
//        session.setAttribute("code", code);
        //4.保存验证码到Redis
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone, code,LOGIN_CODE_TTL, TimeUnit.MINUTES);
        //5.发送验证码
        log.debug("发送短信验证码成功，验证码：{}", code);
        //6.返回结果
        return Result.ok();
    }
    /**
     * 登录功能
     * @param loginForm 登录参数，包含手机号、验证码；或者手机号、密码
     */
    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        // 1.校验手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)) {
            // 2.如果不符合，返回错误信息
            return Result.fail("手机号格式错误！");
        }
        // 3.校验验证码
        //Object cacheCode = session.getAttribute("code");

        //3.从Redis获取验证码并校验
        Object cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        String code = loginForm.getCode();
        if(cacheCode == null || !cacheCode.toString().equals(code)){
            //3.不一致，报错
            return Result.fail("验证码错误");
        }
        //4.一致，根据手机号查询用户
        User user = query().eq("phone", phone).one();

        //5.判断用户是否存在
        if(user == null){
            //不存在，则创建
            user =  createUserWithPhone(phone);
        }
        //7.保存用户信息到session中
        //session.setAttribute("user", BeanUtil.copyProperties(user, UserDTO.class));//拷贝
        //7.保存用户信息到Redis中
        //7.1生成token，作为登录令牌
        String token = UUID.randomUUID().toString( true);
        // 7.2.将User对象转为HashMap存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        HashMap<String, String > userMap = new HashMap<>();
        userMap.put("icon", userDTO.getIcon());
        userMap.put("id", String.valueOf(userDTO.getId()));
        userMap.put("nickName", userDTO.getNickName());
        //7.3.存储到Redis中
        String tokenKey = LOGIN_USER_KEY + token;
        stringRedisTemplate.opsForHash().putAll(tokenKey, userMap);
        //7.4.设置过期时间
        stringRedisTemplate.expire(tokenKey, LOGIN_USER_TTL, TimeUnit.MINUTES);
        //8.返回token
        return Result.ok(token);
    }

    private User createUserWithPhone(String phone) {
        //创建用户
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        //保存用户
        save(user);
        return user;
    }
}
